//tcpserver.cc
#include <iostream>
#include <cstring>
#include <strings.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
using namespace std;
 
int main(int argc, char *argv[])
{
    //创建套接字
    int sk = socket(AF_INET, SOCK_STREAM, 0);
 
    struct sockaddr_in server;
    bzero(&server, sizeof(server));
    server.sin_family = AF_INET;
    server.sin_port = htons(atoi(argv[1]));
    server.sin_addr.s_addr = htonl(INADDR_ANY);
    //端口绑定
    bind(sk, (struct sockaddr*)&server, sizeof(server));
 
    //监听
    listen(sk, 5);
 
    struct sockaddr_in client;
    bzero(&client, sizeof(client));
    socklen_t len = sizeof(client);
    //接受连接请求
    int talk = accept(sk, (struct sockaddr*)&client, &len);
 
    //发送数据
    send(talk, "Hello", strlen("Hello") + 1, 0);
    //接收数据
    char buff[1024] = {'\0'};
    recv(talk, buff, sizeof(buff), 0);
    cout << buff << endl;
 
    //关闭套接字
    close(talk);
    close(sk);
    return 0;
}